鱼刺分支水平井在稠油油藏中的应用

鱼刺分支水平井根据油藏条件设计井眼并进行井眼空间分布,能有效增加油层的裸露面积,提高油藏动用程度,增大蒸汽波及体积,最终达到提高采收率的目的.杜84-兴H238Z井是辽河油田在超稠油油藏中部署和实施的第一口鱼刺分支水平井,共4个分支,水平段总长837 m.该井在井身结构优化、钻井技术、储集层保护技术、完井技术等方面均取得了实质性突破,为进一步推广应用鱼刺分支井提供了一定的参考依据.悬空侧钻技术是鱼刺分支水平井的关键技术.利用LWD随钻测井技术进行地质导向钻井作业,可以有效地提高储集层判别精度和轨迹控制精度,从而提高实施效果.杜84-兴H238Z井投产后蒸汽吞吐最高日产量达到152.6 t,平均日产量是同区块常规水平井的1.41～1.85倍,效果显著.

Application of herringbone multilateral horizontal well in heavy oil reservoirs

Herringbone multilateral wells and borehole allocation designed according to reservoir conditions can effectively increase the bare area of reservoirs, the deliverability, the swept volume, and the oil recovery. The Well Du 84-Xing H238Z, which is the first herringbone multilateral well allocated and implemented in the Liaohe Oilfield, has four branches and is 837 meters long in horizontal section. The well makes substantial breakthroughs in well construction, optimized drilling technology, formational protection and completion technology. Sidetracking technology is the key technology for herringbone multilateral wells, and can improve discrimination accuracy and trajectory control accuracy through logging while drilling (LWD). After the Well Du 84-Xing H238Z was put into production, its maximum daily rate of cyclic steam stimulation achieved 152.6 ton, the average daily rate was 1.41-1.85 times that of other wells in the same block.